Gyrotron Development in EU for W7-X and ITER


Manfred Thumm


Forschungszentrum Karlsruhe, Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM),

Postfach 3640, 76021 Karlsruhe, Germany


Universität Karlsruhe, Institut für Höchstfrequenztechnik und Elektronik, Kaiserstr. 12, 76131 Karlsruhe






The long term strategy of the EU in the field of gyrotrons for magnetic confinement fusion plasma applications is based on two approaches: an R&D in laboratories to develop advanced concepts and industrial development of state-of-the-art tubes for use in present experiments like TCV, Tore Supra  (118 GHz, 0.5 MW, CW) and W7-X (140 GHz, 1 MW, CW). The results from these two approaches are then applied to the development of a coaxial-cavity gyrotron operating at 170 GHz and delivering 2 MW-CW for the electron cyclotron wave system of ITER. The paper will recall the main achievements in the case of the 140 GHz gyrotron and will outline the present status of the 170 GHz gyrotron development.